NDLI: Photoreduction of Cr(vi) using hydroxoaluminiumtricarboxymonoamide phthalocyanine adsorbed on TiO<sub>2</sub>

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Photochemical & Photobiological Sciences Vol - 8 Issue - 4

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Photoreduction of Cr(vi) using hydroxoaluminiumtricarboxymonoamide phthalocyanine adsorbed on TiO₂

Content Provider	Royal Society of Chemistry (RSC)
Author	Grela, María A. Meichtry, Jorge M. Iorio, Yesica Di Rodríguez, Hernán B. Rivera, Verónica Román, Enrique San Litter, Marta I.
Copyright Year	2009
Abstract	Hydroxoaluminiumtricarboxymonoamide phthalocyanine (AlTCPc) adsorbed at different loadings on TiO2 Degussa P-25 was tested for Cr(VI) photocatalytic reduction under visible irradiation in the presence of 4-chlorophenol (4-CP) as sacrificial donor. A rapid reaction takes place in spite of the presumable aggregation of the dye on the TiO2 surface. The removal of Cr(VI) is fairly negligible under visible-light irradiation, either without photocatalyst or in the presence of bare TiO2. The fast capture of conduction band electrons by Cr(VI), which forms a surface complex with TiO2, inhibits the formation of reactive oxygen species in the reductive pathway. This fact and the easier oxidation of 4-CP as compared to AlTCPc hinder the photobleaching of the dye and make feasible Cr(VI) reduction under visible irradiation. The consumption of Cr(VI) follows a pseudo-first order kinetics; the decay constant depends, in the studied range, on the photocatalyst mass, but it is barely affected by dye loading. The presence of 4-CP is essential, but its concentration has no effect on the Cr(VI) decay rate. Oxidation products of 4-CP, such as hydroquinone, catechol or benzoquinone, are not observed. Direct evidence of the one-electron reduction of Cr(VI) to Cr(V) was obtained by EPR spectroscopy using citric acid as Cr(V) trapping agent. In this case, disappearance of Cr(V) also follows a first order decay, but conduction band electrons do not seem to be involved. The fact that oxidation products of 4-CP are not observed is consistent with the fast dark removal of reaction intermediates by Cr(V), proved by EPR.
Starting Page	604
Ending Page	612
Page Count	9
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	8
Issue Number	5
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b816441j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Reactive oxygen species EPR Photocatalysis Catechol Benzoquinone Exponential decay Evonik Industries Hydroquinone Degussa Phthalocyanine Dye Chlorophenol Valence and conduction bands Electron paramagnetic resonance Photobleaching
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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